226 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



therefore stand as Bliinichthys cataractw. The teeth of the typical speci- 

 men have never been examined. The difference in the dentition of Gohio 

 and Rhinichthys does not therefore affect the correctness of this identi- 

 fication. 



17. Leuciscus boucardi Giiutlior. 



Cat. Fishes Brit. Mas. vii, 485. 



The teeth of this species have a very narrow grinding surface. It is 

 therefore probably referable to the genus Myloleucus as understood by 

 me. 



18. Ceratichthys sallaei Glintlier. 



Cat. Fishes Brit. Miis. vii, 484. 



As this sj^ecies has no barbels, the propriety of its reference to 

 Ceratichthys is not evident. It has the teeth 4-4 with grinding surface, 

 and is therefore referable to the genus Hud^onius {Sybopsis Cope) as now 

 understood by me. 



19. Ceratichthys cuniingi Giiuther. 



Cat. Fisht^s Brit. Miis. vii, 177 



This species is a true Ceratichthys, evidently closely related to C. 

 amblops. It perhai>s was not taken in California. 



20. Graodus nigrotaeniatus Giiuther. 



Cat. Fishes Brit. Mns. vii, 485. 



There are three typical examples of this species. The teeth of two of 

 them were examined by Dr. Giinther, and have, as stated by their de- 

 scriber, "pharyngeal teeth quite rudimental replaced by a somewhat 

 uneven ridge of the bone." The third specimen, however, jjroved on 

 examination to have developed teeth, of the ordinary sort, two on each 

 side. Traces of the roots of similar teeth were visible on the other 

 specimens, but in none were any evidences of the existence of a greater 

 number. It is, therefore, possible that the normal number is 2-2. It 

 is my opinion, however, that the teeth are normally 4-4, and that in 

 these examples they have been lost, either by natural shedding or 

 tlirough the softening due to long preservation in spirits. If this view 

 is correct, the genus Graodus should be suppressed. As the teeth are 

 without grinding surface, tlie species should be referred to the genus 

 Cliola, as understood by me, and should stand as Cliola nigrotceniata. 

 If the teeth are normally 2-2, the genus Graodus should be retained. 



Tlie writer wishes to express his obligations to Dr. Giinther for the 

 permission to examine these and other specimens in the British Museum, 

 and to Professors Vaillant and Sauvage for similar favors at the Mu- 

 seum at Paris. 



October 20, 1879. 



